Adoption curves are s-shaped, usually. There are infliction points at the start: https://www.stratechi.com/adoption-curves/

I mean colloquially. Look up the English definition instead of the mathematical one.

If you'd like to be this pedantic, the point at which a curve turns from linear to exponential can reasonably be described as an inflection point.

In the common usage of exponential not meaning exponential at all, sure anything goes I guess.

This is what separates most humans from robots right?: The fact that I can say something without using the pedantic technical definition and for a human with normal intelligence to still know what I'm talking about.

I guess by someone announcing their confusion they are also announcing the fact that they are NOT part of THAT group of humans. Or they just want to be a smart ass. Pick one.

I have never gotten past a captcha.

Stop being a smart ass.